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Open AccessFeature PaperArticle

Effect of Microstructure on the Corrosion Resistance of TIG Welded 1579 Alloy

1
Institute of Chemistry of FEB RAS, 159 Pr. 100-letiya Vladivostoka, Vladivostok 690022, Russia
2
School of Engineering, Far Eastern Federal University, 8 Sukhanova St., Vladivostok 690950, Russia
*
Author to whom correspondence should be addressed.
Materials 2019, 12(16), 2615; https://doi.org/10.3390/ma12162615
Received: 10 July 2019 / Revised: 11 August 2019 / Accepted: 12 August 2019 / Published: 16 August 2019
(This article belongs to the Special Issue Corrosion and Corrosion Protection for Light Metals/Alloys)
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Abstract

The paper studies microstructure, chemical composition and corrosion activity of the tungsten inert gas welded joint of the Al-Mg-Sc alloy. An intensive corrosion attack of the heat affected zone (HAZ) was found due to precipitation of secondary phases at recrystallized grain boundaries. The ccorrosion process initiated along the boundary of α-Al grains, where a high concentration of anodic (Mg2Si and Mg2Al3) and cathodic phases ((MnFe)Al6) was observed. Increased temperatures during welding led to coalescence of the anodic phases in HAZ. Additionally, HAZ was found to be enriched with hard intermetallic compounds (Mg2Si and (MnFe)Al6). This area had a higher microhardness (930 MPa) compared to base metal (BM, 895 MPa) and fusion zone (FZ, 810 MPa). The volume fraction of secondary phases was 26% in BM, 28% in FZ and 38% in HAZ. The average grain size increased in the following order: (9 ± 3) µm (BM) < (16 ± 3) µm (HAZ) < (21 ± 5) µm (FZ). A plasma electrolytic oxidation (PEO) coating of aluminum-based material was applied to protect the weld from oxidation. The PEO-coating provided a high corrosion protection in the aggressive Cl-containing environment. View Full-Text
Keywords: aluminum alloy; welding; localized corrosion; intermetallic compounds; protective coating aluminum alloy; welding; localized corrosion; intermetallic compounds; protective coating
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Gnedenkov, A.S.; Sinebryukhov, S.L.; Mashtalyar, D.V.; Imshinetskiy, I.M.; Vyaliy, I.E.; Gnedenkov, S.V. Effect of Microstructure on the Corrosion Resistance of TIG Welded 1579 Alloy. Materials 2019, 12, 2615.

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